JP3301065B2 - Waste melting furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a waste melting furnace.
BACKGROUND ART A waste melting furnace using an arc discharge electrode, a resistance heating electrode, a plasma torch or the like as a heat source is used for melting treatment of municipal waste incineration ash and industrial waste containing combustibles, non-combustibles and metals. Such waste melting furnaces include a so-called circular furnace having a circular plane and a so-called rectangular furnace having a rectangular plane. In recent years, a rectangular furnace which is easy to scale-up, easy to maintain and manage, and has excellent treatment efficiency. Is attracting attention. The present invention relates to an improvement of such a rectangular furnace.

[0002]

2. Description of the Related Art Conventionally, as a rectangular furnace as described above, a furnace body having a rectangular flat surface, a furnace cover having a rectangular flat surface attached to the furnace body, and a long side substantially at the center of the furnace cover. A plurality of electrodes provided at predetermined intervals along the direction, and a waste input port opened between the electrodes at a substantially central portion of the furnace lid,
A structure in which the whole is formed in a rectangular parallelepiped has been proposed (JP-A-61-213510). However, in such a conventional rectangular furnace, since the refractory bricks forming the hearth are laid in a plane, the hearth is easily damaged, and the molten metal tends to excessively stay in the hearth. There is. Molten metal generated with the melting treatment of waste enters through gaps between refractory bricks laid flat and solidifies, causing the refractory bricks to float, resulting in an uneven hearth. When the hearth becomes uneven, the molten metal is more likely to stay. It is very troublesome to repair or repair the refractory bricks of the hearth that has become uneven because the molten metal is solidified on the surfaces of the refractory bricks and between them. In addition, the conventional rectangular furnace has a problem in that the molten slag and the molten metal are discharged from the same discharge port, so that a separation process such as magnetic separation is required when utilizing the slag as a resource.

[0003]

The problem to be solved by the present invention is that in a conventional rectangular furnace, the refractory bricks forming the hearth are laid in a plane, so that the hearth is easily damaged, In addition, the molten metal tends to excessively stay in the hearth, and the molten slag and the molten metal are discharged from the same discharge port, so that a separation means is required for utilizing the slag as resources.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a furnace body having a rectangular flat surface, a furnace cover having a rectangular flat surface attached to the furnace body, and a substantially central portion of the furnace cover. A plurality of electrodes or plasma torches provided at predetermined intervals along the long side direction, and a waste input port opened between the electrodes or the plasma torch at a substantially central portion of the furnace lid. In the waste melting furnace, the hearth in the short side direction of the furnace main body is formed in an inverted arch shape, and a molten slag discharge port is opened on one side in the long side direction of the furnace main body, and the molten slag discharge is provided. A molten metal discharge opening formed at one side in a short side direction of the furnace main body at a position below the outlet and close to the hearth formed in an inverted arch shape; Pertaining to the furnace.

[0005] The waste melting furnace according to the present invention also has a rectangular flat furnace body, a rectangular furnace cover attached to the furnace body, and a rectangular furnace cover, similar to the conventional rectangular furnace described above. An electrode or a plasma torch provided at a predetermined interval along a long side direction at a substantially central portion, and a waste inlet provided between the electrodes or the plasma torch at a substantially central portion of the furnace lid. It has a rectangular shape as a whole.

[0006] In the waste melting furnace according to the present invention, the hearth in the short side direction of the furnace body is formed in an inverted arch shape. The refractory bricks that form the hearth in the short side direction are laid in an inverted arch shape. Further, a molten slag discharge port is opened on one side surface of the furnace main body in the long side direction, and the furnace main body is located at a position below the molten slag discharge port and in proximity to a hearth formed in an inverted arch shape. A molten metal outlet is opened on one side in the short side direction. A molten slag discharge port and a molten metal discharge port are separately opened in the furnace body.The molten slag discharge port is on one side in the long side direction of the furnace body, and the molten metal discharge port is on the short side direction of the furnace body. Is established on one side of
The molten metal discharge port is opened below the molten slag discharge port and at a position close to a hearth formed in an inverted arch shape.

It is preferable that a plurality of molten slag discharge ports are formed at predetermined intervals on one side of the furnace body in the long side direction. This is because, for example, when two molten slag discharge ports are opened, one can be used at the time of repair of one. In addition, the molten metal discharge port is composed of a weir erected on the extension of the deepest part along the long side direction of the hearth formed in an inverted arch shape and a reverse weir formed on one side in the short side direction of the furnace body. It is preferable to open it in between. This is because the molten metal can be smoothly discharged by the overflow method.

[0008]

According to the waste melting furnace of the present invention, the refractory bricks forming the hearth in the short side direction of the furnace main body are laid in the shape of an inverted arch, and the refractory bricks are in a relationship of pressing each other downward. Therefore, in addition to the fact that the gap between the refractory bricks is small, even if the molten metal intrudes from the gap and solidifies, the refractory brick does not rise, so that the hearth becomes uneven and damaged. And the molten metal can be prevented from excessively staying in the hearth. Moreover,
Since the molten slag and the molten metal are discharged from separate discharge ports dedicated to each, the separation means is not required when these are used as resources.

[0009]

FIG. 1 is a plan view schematically showing one embodiment of a waste melting furnace according to the present invention, FIG. 2 is a longitudinal sectional view in the short side direction showing the same embodiment, and FIG. FIG. 5 is a partial vertical cross-sectional view in the long side direction showing Furnace body 12 having a rectangular plane and furnace body 12
The waste melting furnace 11 provided with a furnace lid 13 having a rectangular plane attached to the furnace is entirely rectangular. The furnace lid 13 is provided with a total of six arc discharge electrodes 21 at predetermined intervals along the long side direction substantially through the center portion thereof, and a total of five arc discharge electrodes 21 are provided between the arc discharge electrodes 21. Mouth 22
And an exhaust port 23 is opened in one corner.

The furnace body 12 is made of a furnace shell 31 with a refractory brick 33 lined through a refractory material 32.
The refractory brick 33a forming 2a is laid in an inverted arch shape in the short side direction. The furnace main body 12 has a total of two molten slag discharge ports 41 formed at predetermined intervals on one side surface in the long side direction, and is formed in an inverted arch shape at a position below the molten slag discharge port 41. The firebrick 3 laid in an inverted arch shape near the hearth 12a at substantially the center of one side surface of the furnace body 12 in the short side direction, that is, forming the hearth 12a.
On the extension of the deepest part of 3a, a molten metal discharge port 42 is opened.

The molten metal discharge port 42 is connected to a weir 42a erected on the extension of the deepest part of the refractory brick 33a and a short side direction of the furnace body 12 so that the molten metal A in the furnace is discharged in an overflow manner. And a reverse weir 12b separating the molten metal and the molten slag formed on one side surface, and a molten metal outlet 42b is opened in the weir 42a.

[0012]

As is apparent from the above description, the present invention described above can prevent the hearth from being damaged in a waste melting furnace having a rectangular flat surface, and prevent the molten metal from excessively staying in the hearth. In addition to this, there is an effect that the slag can be recycled and used without applying separation means.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view in the short side direction showing the same embodiment as FIG. 1;

FIG. 3 is a partial longitudinal sectional view in the long side direction showing the same embodiment as FIG. 1;

[Explanation of symbols]

11: Waste melting furnace, 12: Furnace body, 13 ...
· Furnace lid, 21 ··· Arc discharge electrode, 22 ··· Waste input port, 23 ··· exhaust port, 31 ··· Furnace shell, 32 ···
・ Fireproof material, 33 ・ ・ ・ Fire brick, 41 ・ ・ ・ Molten slag outlet, 42 ・ ・ ・ Molten metal outlet

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-213510 (JP, A) JP-A-62-237985 (JP, A) JP-A-57-2916 (JP, A) JP-A-61-27985 79907 (JP, A) JP-A-52-97370 (JP, A) JP-A-61-168719 (JP, A) JP-A-52-30202 (JP, A) (58) Fields investigated (Int. ⁷ , DB name) B09B 3/00 F23J 1/00 F23J 1/08 F27B 3/08

Claims (2)

(57) [Claims] 1. A furnace body having a rectangular flat surface, a furnace lid having a rectangular shape attached to the furnace body, and a plurality of furnace covers provided at predetermined intervals along a long side direction at a substantially central portion of the furnace cover. In a waste melting furnace having an electrode or a plasma torch and a waste inlet opened between the electrode or the plasma torch at substantially the center of the furnace lid, the furnace in the short side direction of the furnace body. The floor is formed in an inverted arch shape, a molten slag discharge port is opened on one side surface of the furnace body in the long side direction, and the floor formed below the molten slag discharge port and formed in an inverted arch shape. A waste melting furnace, characterized in that a molten metal discharge port is opened on one side in a short side direction of the furnace body at a position close to the hearth. 2. A molten metal discharge port is formed by a weir erected on an extension of a deepest portion along a long side direction of a hearth formed in an inverted arch shape and one side surface in a short side direction of the furnace main body. The waste melting furnace according to claim 1, wherein the waste melting furnace is set up between the reverse weir and the reverse weir.